CN109281968B - Brake device for stepless transmission - Google Patents
Brake device for stepless transmission Download PDFInfo
- Publication number
- CN109281968B CN109281968B CN201811250859.2A CN201811250859A CN109281968B CN 109281968 B CN109281968 B CN 109281968B CN 201811250859 A CN201811250859 A CN 201811250859A CN 109281968 B CN109281968 B CN 109281968B
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- brake
- brake pad
- plate
- control system
- electric control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
- F16D65/72—Slack adjusters hydraulic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
Abstract
The utility model relates to an automobile brake technical field discloses a brake equipment for continuously variable transmission, including the brake disc, the apparatus further comprises a rotating shaft, the mount, brake block and hydraulic system, still including the wearing and tearing detecting element who is used for detecting the brake block wearing and tearing condition and carry out the compensating unit who compensates to the thickness that the brake block was worn and torn after the brake block wearing and tearing, wearing and tearing detecting element passes the central electrical system of car back with wearing and tearing data, central electrical system carries out the analysis back to data, central electrical system sends a signal to compensating unit when needs compensate, start compensating unit. The scheme solves the problem of brake sensitivity reduction caused by abrasion of the brake pad.
Description
Technical Field
The invention relates to the technical field of automobile brake devices, in particular to a brake device for a stepless speed changer.
Background
Continuously variable refers to a transmission system that can continuously achieve any ratio in the transmission range. The best match of the drive train to the engine's operating conditions can be obtained by stepless speed change. Common continuously variable transmissions are hydromechanical and metal belt continuously variable transmissions (VDT-CVT) and variable ramp type continuously variable transmissions.
Nowadays, the application of the continuously variable transmission in the automobile field is more and more extensive, and most of the brake devices for the current continuously variable transmission comprise a brake disc, a rotating shaft, a fixing frame, a brake pad and a hydraulic system, wherein the brake disc is fixedly connected with the rotating shaft, the brake pad is fixed on the fixing frame and respectively positioned on two sides of the brake disc, the hydraulic system comprises an oil inlet path and an oil return path, and the hydraulic system is connected with the brake pad and controls the movement of the brake pad. The hydraulic system is controlled by a central electric control system of the automobile, the central electric control system receives a signal that a driver tramples a brake plate and transmits the signal to the hydraulic system, the hydraulic pressure is used for pushing a brake pad and a brake disc to generate pressure, and the brake disc is braked by friction force.
In the braking process, the surface of the brake pad is in surface contact with the surface of the brake disc, when the brake pad is worn rapidly due to heating of the brake pad caused by one-time braking, the brake pad is thinned, a driver is required to step on the brake with larger force when the brake is braked next time, and the hydraulic pressure is increased, so that the braking effect before the wear can be achieved. That is, when the brake pad is worn, the sensitivity of the brake is reduced. The driver is familiar with the vehicle, and may get the expected braking effect by braking with the previous force by being used to subconsciously, but at this time, the brake pad is worn, the sensitivity is reduced, the braking effect is weakened, the expected parking effect cannot be achieved, and the safety accident is easily caused. Frequent replacement of the brake pads will add significant cost and waste the brake pads.
Disclosure of Invention
The invention aims to provide a brake device for a stepless speed changer, which aims to solve the problem of reduced brake sensitivity caused by abrasion of a brake pad.
In order to achieve the above object, the basic scheme of the invention is as follows:
the brake device for the stepless speed changer comprises a brake disc, a rotating shaft, a fixing frame, a brake pad, a hydraulic system, a wear detection unit for detecting the wear condition of the brake pad and a compensation unit for compensating the worn thickness of the brake pad after the brake pad is worn, wherein the wear detection unit is electrically connected with a central electric control system of an automobile, and the central electric control system is electrically connected with the compensation unit.
The beneficial effects of the basic scheme are as follows: (1) this scheme sets up the compensation unit, can compensate brake block wearing and tearing part when the brake block is worn and torn, can remain the sensitivity of brake all the time to make the driver can reach the same brake effect with the same dynamics always, avoid brake sensitivity to reduce, the driver does not carry out the problem that the adjustment of dynamics leads to the brake effect not good even causes the incident.
(2) This scheme is compensated earlier after the brake block is worn and torn, guarantees the sensitivity of brake, just changes with current brake block wearing and tearing and compare, and this scheme has practiced thrift the cost of frequently changing the brake block, has also avoided the waste of brake block.
Further, the wearing and tearing detecting element includes support block, extension spring and laser range finder, support block includes mutually perpendicular's first board and second board, be equipped with the spout under the mount on the terminal surface, support block's right angle department is fixed with universal ball, universal ball sliding connection is in the spout, be fixed with the extension spring between first board and the mount, be equipped with the bar groove on the second board, be equipped with magnetism under the mount between terminal surface and the first board and detain, laser range finder fixes on the mount, under the condition that does not start the brake, laser range finder detects to the position of support block, the central electrical system signal connection of laser range finder and car.
Under the condition that the brake is not started, the first plate is positioned on one side of the brake pad close to the brake disc and is abutted against the friction surface of the brake pad, and the second plate is positioned above the brake pad. When the brake is started, the brake block moves towards the brake disc, the brake block abuts against the first plate, the abutting block cannot move towards the direction of the brake disc under the action of the tension spring, and the abutting block rotates around the right angle. After the rotation, the first plate is contacted with the fixed frame, and under the action of the magnetic buckle, the first plate is fixed with the fixed frame, so that the pressing block is prevented from being pulled to move under the action of the tension spring. At the moment, the first plate is not opposite to the brake pad any more, and the brake pad continues to move towards the brake disc and is abutted against the brake disc, so that braking is realized. When the brake is loosened, the brake pad is far away from the brake disc, the brake pad presses against the second plate, the first plate is separated from the fixing frame at the moment, the pressing block reversely rotates around the right-angle position, and the first plate presses against the friction surface of the brake pad again.
The laser range finder detects the position of the pressing block when the brake is not started, transmits a detected signal to a central electric control system of the automobile, and judges whether the compensation unit needs to be started or not by the central electric control system. When the position moving distance of the pressing block is larger than d1(d1The thickness of the brake pad which is abraded and reduces the brake sensitivity, namely the moving distance of the pressing block), the central electric control system starts the compensation unit to compensate the abrasion of the brake pad.
Further, the compensation unit is including increasing flow tube, motor, threaded rod, branch pipe, check valve and piston plate, increase flow tube both ends all with advance oil circuit intercommunication, the check valve is fixed at the both ends that increase flow tube, just the direction of check valve is the oil feed direction, branch pipe and increase flow tube intercommunication, piston plate sealing sliding connection is in the branch pipe, piston plate middle part is equipped with the screw hole, the one end of threaded rod is fixed with the output shaft of motor, the other end and the screw hole threaded connection of threaded rod, the motor is by the central electrical system automatic control of car.
When the central electric control system sends a starting signal to the compensation unit, the motor is started, the motor drives the threaded rod to rotate, the piston plate in threaded connection with the threaded rod moves in the axial direction of the threaded rod towards the flow increasing pipe, the piston plate moves to extrude hydraulic oil in the branch pipe and the flow increasing pipe, the hydraulic pressure in the branch pipe and the flow increasing pipe is increased, the hydraulic oil enters the oil inlet way through the check valve, the oil inlet amount of the oil inlet way is increased, the moving distance of the brake pad is increased, and the compensation of the abrasion of the brake pad is realized. After the brake is finished, the motor reversely rotates to return, the piston plate returns, the hydraulic pressure in the branch pipe and the flow increasing pipe is reduced, and the hydraulic oil enters the branch pipe and the flow increasing pipe again to prepare for the next brake. When compensation is not needed, the compensation unit is not started, and only the hydraulic system pushes the brake pad.
And the brake pad warning device further comprises a warning unit for reminding a driver of replacing the brake pad, and the warning unit is electrically connected with the central electric control system.
The thickness of the brake pad of a common automobile is 1.5cm, and when the thickness of the brake pad is less than 0.5cm, the brake pad should be overhauled and replaced in time. The existing brake device can not see the thickness of the brake pad from the outside, the tire needs to be disassembled and then the brake pad needs to be checked, and the abrasion condition of the brake pad can not be mastered in time. When the thickness of the brake pad is lower than 0.5cm, the central electric control system controls the early warning unit to start. According to the scheme, the thickness of the brake pad is detected through the abrasion detection unit, a signal sent by the abrasion detection unit is processed by the central electric control system, and then the early warning unit is controlled to start.
Further, the early warning unit comprises an air cylinder, a connecting rod and a sliding block, the sliding block is connected below the brake pedal in a sliding mode, one end of the connecting rod is fixedly connected with a piston rod of the air cylinder, the other end of the connecting rod is connected with the sliding block, and the air cylinder is electrically connected with the central electric control system.
When a central electric control system of the automobile sends a signal for starting the early warning unit, the cylinder receives the starting signal, a piston rod of the cylinder extends out, and the sliding block is pushed to slide out under the action of the connecting rod. When a driver feels the sliding plate below the brake pedal plate in the braking process, the driver knows that the brake block needs to be replaced.
Further, the motor is a multi-gear motor. According to different worn thicknesses of the brake pad, the central electric control system analyzes and judges signals sent by the wear detection unit, then the motor is controlled to start different gears, the thinner the brake pad is, the higher the rotation speed is, so that the larger the moving distance of the piston plate in unit time is, the more hydraulic oil is supplemented to an oil inlet path, the larger the compensation moving distance of the brake pad is, and the compensation moving distance corresponds to the worn thickness.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of A in FIG. 1;
FIG. 3 is a schematic view of the pressing block of FIG. 2 when the brake pad contacts the brake disc;
FIG. 4 is a schematic structural diagram of a compensation unit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an early warning unit in an embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the brake disc comprises a brake disc 1, a rotating shaft 2, a fixing frame 3, a brake pad 4, a first plate 5, a second plate 6, a universal ball 7, a sliding groove 8, a tension spring 9, a flow increasing pipe 10, a motor 11, a threaded rod 12, a branch pipe 13, a one-way valve 14, a piston plate 15, an oil inlet path 16, an air cylinder 17, a connecting rod 18, a sliding block 19 and a brake pedal 20.
Examples
Substantially as shown in figure 1: the brake device for the stepless speed changer comprises a brake disc 1, a rotating shaft 2, a fixing frame 3, a brake pad 4, a hydraulic system, a wear detection unit, a compensation unit and an early warning unit. The brake disc 1 is fixedly connected with the rotating shaft 2, the brake pads 4 are fixed on the fixing frame 3 and are respectively positioned on two sides of the brake disc 1, the hydraulic system comprises an oil inlet path 16 and an oil return path, and the hydraulic system is connected with the brake pads 4 and controls the brake pads 4 to move.
Referring to fig. 2 and 3, the wear detection unit includes a pressing block, a tension spring 9 and a laser range finder (in this embodiment, HT-204 series of HCJYET is used), the pressing block includes a first plate 5 and a second plate 6 perpendicular to each other, a sliding groove 8 is provided on the lower end face of the fixing frame 3, a universal ball 7 is fixed at the right angle of the pressing block, and the universal ball 7 is slidably connected in the sliding groove 8; a tension spring 9 is fixed between the first plate 5 and the fixed frame 3, and a strip-shaped groove for the spring to pass through is arranged on the second plate 6; a magnet is fixed on the lower end surface of the fixed frame 3, and the first plate 5 is made of steel materials; the laser range finder is fixed on the fixing frame 3. The laser range finder is in electrical signal connection with a central electric control system of the automobile (in this embodiment, the central electric control system of the automobile is not modified, but the central electric control system of the existing automobile is a control unit, and can receive and process data, such as functions of display screen input, multimedia and the like, so that the central electric control system of the automobile is only borrowed from the existing functions). Under the condition that the brake is not started, the laser range finder detects the position of the pressing block and transmits a position signal back to a central electric control system of the automobile, and after the central electric control system analyzes data, the central electric control system sends a signal to the compensation unit when compensation is needed, and the compensation unit is started.
Referring to fig. 4, the compensating unit includes a booster pipe 10, a motor 11, a threaded rod 12, a branch pipe 13, a check valve 14 and a piston plate 15, wherein the motor 11 is a multi-gear motor 11 (in the embodiment, the Yongji FK09E is used). The two ends of the flow increasing pipe 10 are communicated with the oil inlet path 16, the check valves 14 are fixed at the two ends of the flow increasing pipe 10, the direction of each check valve 14 is the oil inlet direction, the branch pipe 13 is communicated with the flow increasing pipe 10, the inner wall of each branch pipe 13 is provided with a strip-shaped block along the axial direction of each branch pipe 13, the piston plate 15 is connected in each branch pipe 13 in a sealing and sliding mode, and the piston plate cannot rotate under the action of the strip-shaped blocks. The middle part of the piston plate 15 is provided with a threaded hole, one end of the threaded rod 12 is fixed with an output shaft of the motor 11, the other end of the threaded rod 12 is in threaded connection with the threaded hole, the motor 11 is electrically connected with a central electric control system of the automobile, and the central electric control system controls the opening and closing and the power of the central electric control system.
Referring to fig. 5, the early warning unit includes a cylinder 17, a connecting rod 18 and a sliding block 19, the sliding block 19 is slidably connected below the brake pedal 20, one end of the connecting rod 18 is fixedly connected with a piston rod of the cylinder 17, the other end of the connecting rod 18 is connected with the sliding block 19, and the cylinder 17 is electrically connected with the central electronic control system.
The specific implementation process is as follows: in the case of non-activated braking, the first plate 5 is located on the side of the brake pad 4 close to the brake disc 1 and against the friction surface of the brake pad 4, and the second plate 6 is located above the brake pad 4. When the brake is started, the brake block 4 moves towards the brake disc 1, the brake block 4 presses against the first plate 5, the pressing block cannot move towards the brake disc 1 under the action of the tension spring 9, and the pressing block rotates around a right angle. After the rotation, the first plate 5 contacts with the fixing frame 3, and under the attraction effect of the first plate 5 made of the magnet and the steel, the first plate 5 is fixed with the fixing frame 3, so that the pressing block is prevented from moving under the action of the tension spring 9. At the moment, the first plate 5 is no longer opposite to the brake pad 4, and the brake pad 4 continues to move towards the brake disc 1 and is abutted against the brake disc 1, so that braking is realized. When the brake is released, the brake block 4 is far away from the brake disc 1, the brake block 4 presses the second plate 6, at the moment, the first plate 5 is separated from the fixing frame 3, the pressing block reversely rotates around the right angle, and the first plate 5 presses against the friction surface of the brake block 4 again.
The laser range finder detects the position of the pressing block when the brake is not started, transmits a detected signal to a central electric control system of the automobile, and judges whether the compensation unit needs to be started or not by the central electric control system. When the position moving distance of the pressing block is larger than d1(d1The thickness of the brake pad 4, i.e., the moving distance of the pressing block, which is to reduce the braking sensitivity, can be obtained through a limited number of experiments), the central electronic control system starts the compensation unit to compensate the wear of the brake pad 4.
When the central electric control system sends a starting signal to the compensation unit, the motor 11 is started, the motor 11 drives the threaded rod 12 to rotate, the piston plate 15 in threaded connection with the threaded rod 12 moves towards the direction of the flow increasing pipe 10 along the axial direction of the threaded rod 12, the piston plate 15 moves to extrude hydraulic oil in the branch pipe 13 and the flow increasing pipe 10, the hydraulic pressure in the branch pipe 13 and the flow increasing pipe 10 is increased, the hydraulic oil enters the oil inlet path 16 through the check valve 14, the oil inlet amount of the oil inlet path 16 is increased, the moving distance of the brake pad 4 is increased, and therefore the abrasion compensation of the brake pad 4 is achieved. After braking is finished, the motor 11 reversely rotates to return, the piston plate 15 returns, hydraulic pressure in the branch pipe 13 and the flow increasing pipe 10 is reduced, and hydraulic oil enters the branch pipe 13 and the flow increasing pipe 10 again to prepare for next braking. When no compensation is required, the compensation unit is not activated and the brake pads 4 are pushed only by the hydraulic system. According to different worn thicknesses of the brake pad 4, the central electronic control system analyzes and judges signals sent by the wear detection unit, then the motor 11 is controlled to start different gears, and the thinner the brake pad 4 is, the higher the rotation speed is, so that the larger the moving distance of the piston plate 15 in unit time is, the more hydraulic oil is supplemented to the oil inlet path 16, the larger the compensation moving distance of the brake pad 4 is, and the compensation moving distance corresponds to the worn thickness.
The central electronic control system receives signals of the abrasion detection unit, and when the thickness of the brake pad 4 is lower than 0.5cm (the initial thickness of the brake pad 4 is 1.5cm), the central electronic control system controls the air cylinder 17 to start. When a central electronic control system of the automobile sends a signal for starting the early warning unit, the air cylinder 17 receives the starting signal, a piston rod of the air cylinder 17 extends out, and the sliding block 19 is pushed to slide out under the action of the connecting rod 18. The driver feels the slide plate under the brake pedal 20 during the brake application process, and knows that the brake pad 4 should be replaced.
The foregoing is merely an example of the present invention and common general knowledge in the art of specific structures and/or features of the invention has not been set forth herein in any way. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (5)
1. Brake equipment for infinitely variable transmission, including brake disc, pivot, mount, brake block and hydraulic system, its characterized in that: the automobile brake pad wear-out detection device further comprises a wear detection unit for detecting the wear condition of the brake pad and a compensation unit for compensating the worn thickness of the brake pad after the brake pad is worn, the wear detection unit is electrically connected with a central electric control system of an automobile, the central electric control system is electrically connected with the compensation unit, the wear detection unit comprises a pressing block, a tension spring and a laser range finder, the pressing block comprises a first plate and a second plate which are perpendicular to each other, a chute is arranged on the lower end face of the fixing frame, a universal ball is fixed at the right angle of the pressing block and is slidably connected in the chute, the tension spring is fixed between the first plate and the fixing frame, a strip-shaped groove is arranged on the second plate, a magnetic buckle is arranged between the lower end face of the fixing frame and the first plate, the laser range finder is fixed on the fixing frame, and the position of the pressing block is detected by the laser range, the laser range finder is in electric signal connection with a central electric control system of the automobile.
2. The brake device for a continuously variable transmission according to claim 1, characterized in that: the compensating unit is including increasing flow tube, motor, threaded rod, branch pipe, check valve and piston plate, increase flow tube both ends all with advance oil circuit intercommunication, the check valve is fixed at the both ends that increase flow tube, just the direction of check valve is the oil feed direction, branch pipe and increase flow tube intercommunication, piston plate sealing sliding connection is in the branch pipe, piston plate middle part is equipped with the screw hole, the one end of threaded rod is fixed with the output shaft of motor, the other end and the screw hole threaded connection of threaded rod, the motor is by the central electrical system automatic control of car.
3. The brake device for a continuously variable transmission according to claim 1, characterized in that: the brake pad warning device is characterized by further comprising a warning unit for reminding a driver of replacing the brake pad, and the warning unit is electrically connected with the central electric control system.
4. The brake device for a continuously variable transmission according to claim 3, characterized in that: the early warning unit comprises an air cylinder, a connecting rod and a sliding block, the sliding block is connected below the brake pedal in a sliding mode, one end of the connecting rod is fixedly connected with a piston rod of the air cylinder, the other end of the connecting rod is connected with the sliding block, and the air cylinder is electrically connected with the central electric control system.
5. The brake device for a continuously variable transmission according to claim 2, characterized in that: the motor is a multi-gear motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811250859.2A CN109281968B (en) | 2018-10-25 | 2018-10-25 | Brake device for stepless transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811250859.2A CN109281968B (en) | 2018-10-25 | 2018-10-25 | Brake device for stepless transmission |
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| Publication Number | Publication Date |
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| CN109281968A CN109281968A (en) | 2019-01-29 |
| CN109281968B true CN109281968B (en) | 2020-02-07 |
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| CN201811250859.2A Active CN109281968B (en) | 2018-10-25 | 2018-10-25 | Brake device for stepless transmission |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043587A (en) * | 2019-04-28 | 2019-07-23 | 江苏理工学院 | A kind of automotive brake pads automatic detection device |
| CN113353038B (en) * | 2021-06-22 | 2022-06-14 | 长春工程学院 | Intelligent unmanned automobile power compensation system based on big data |
| CN113790236A (en) * | 2021-11-15 | 2021-12-14 | 杭州银笔科技有限公司 | Wheel hub arresting gear of new energy vehicle |
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| FR2743126B1 (en) * | 1995-12-27 | 1998-03-06 | Plastic Omnium Cie | FRICTION LINING WEAR LIGHT, ESPECIALLY BRAKE PAD |
| FR2765288B1 (en) * | 1997-06-17 | 1999-10-01 | Valeo | FRICTION CLUTCH WITH FRICTION LINING WEAR REPAIR DEVICE, PARTICULARLY FOR A MOTOR VEHICLE |
| JP4935267B2 (en) * | 2006-09-20 | 2012-05-23 | パナソニック株式会社 | Load sensor |
| JP4725980B2 (en) * | 2008-06-30 | 2011-07-13 | 東芝エレベータ株式会社 | Motor braking device |
| CN201650887U (en) * | 2010-04-22 | 2010-11-24 | 吴望杰 | Open type fluid boosting device |
| CN102343549B (en) * | 2011-10-07 | 2013-05-08 | 青岛理工大学 | Method and device for carrying out online detection on abrasion of grinding wheel by using air flow on grinding wheel |
| CN103557252B (en) * | 2013-11-19 | 2016-09-07 | 焦作金箍制动器股份有限公司 | Intelligent compensation device of brake |
| CN204938691U (en) * | 2015-09-08 | 2016-01-06 | 洛阳普凡电气自动化有限公司 | A kind ofly judge the on-Line Monitor Device that gig brake disc friction coefficient reduces |
| DE102015013199A1 (en) * | 2015-10-12 | 2017-04-13 | Wabco Europe Bvba | Monitoring device for a disc brake of a motor vehicle |
| CN107504099B (en) * | 2016-03-28 | 2018-05-18 | 温州极电电子科技有限公司 | A kind of nesting dual brake piece brake units |
| CN107289044B (en) * | 2017-06-20 | 2019-02-05 | 浙江师范大学 | A kind of electromechanical brake and control method |
| CN108343692B (en) * | 2018-02-11 | 2019-08-06 | 隆中控股集团股份有限公司 | A kind of brake wear monitoring system |
| CN108644265B (en) * | 2018-05-22 | 2019-04-23 | 荣成华东锻压机床股份有限公司 | Mechanical press brake pads intelligent measuring and control device |
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Application publication date: 20190129 Assignee: Chongqing Hexin Automobile Technology Co.,Ltd. Assignor: JIULONGPO VOCATIONAL EDUCATION CENTER, CHONGQING Contract record no.: X2021500000006 Denomination of invention: Braking device for continuously variable transmission Granted publication date: 20200207 License type: Exclusive License Record date: 20210510 |